Cape Town, South Africa
Cape Town, South Africa

Cape Peninsula University of Technology, a university in Cape Town, South Africa, is the only university of Technology in the Western Cape province, and is also the largest university in the province, with over 32,000 students. Wikipedia.

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Makinde O.D.,Cape Peninsula University of Technology | Aziz A.,Gonzaga University
International Journal of Thermal Sciences | Year: 2011

The boundary layer flow induced in a nanofluid due to a linearly stretching sheet is studied numerically. The transport equations include the effects of Brownian motion and thermophoresis. Unlike the commonly employed thermal conditions of constant temperature or constant heat flux, the present study uses a convective heating boundary condition. The solutions for the temperature and nanoparticle concentration distributions depend on five parameters, Prandtl number Pr, Lewis number Le, the Brownian motion parameter Nb, the thermophoresis parameter Nt, and convection Biot number Bi. Numerical results are presented both in tabular and graphical forms illustrating the effects of these parameters on thermal and concentration boundary layers. The thermal boundary layer thickens with a rise in the local temperature as the Brownian motion, thermophoresis, and convective heating each intensify. The effect of Lewis number on the temperature distribution is minimal. With the other parameters fixed, the local concentration of nanoparticles increases as the convection Biot number increases but decreases as the Lewis number increases. For fixed Pr, Le, and Bi, the reduced Nusselt number decreases but the reduced Sherwood number increases as the Brownian motion and thermophoresis effects become stronger. © 2011 Elsevier Masson SAS. All rights reserved.

This paper examined the hydromagnetic mixed convection stagnation point flow towards a vertical plate embedded in a highly porous medium with radiation and internal heat generation. The governing boundary layer equations are formulated and transformed into a set of ordinary differential equations using a local similarity approach and then solved numerically by shooting iteration technique together with Runge-Kutta sixth-order integration scheme. A representative set of numerical results are displayed graphically and discussed quantitatively to show some interesting aspects of the pertinent parameters on the dimensionless axial velocity, temperature and the concentration profiles, local skin friction, local Nusselt number and local Sherwood number, the rate of heat and mass transfer. Good agreement is found between the numerical results of the present paper with the earlier published works under some special cases. © Springer Science+Business Media B.V. 2011.

Oguntibeju O.O.,Cape Peninsula University of Technology
HIV/AIDS - Research and Palliative Care | Year: 2012

The development of antiretroviral drugs has significantly changed the perception of HIV/AIDS from a very fatal to a chronic and potentially manageable disease, and the avail-ability and administration of antiretroviral therapy (ART) has significantly reduced mortality and morbidity associated with HIV and AIDS. There is a relationship between ART and quality of life of people living with HIV and AIDS, and several studies have reported a strong positive association between ART and improved quality of life in different domains among people liv-ing with HIV and AIDS in both developed and developing countries. However, a few studies have reported on the negative effects of ART, which directly or indirectly relate to the quality of life and longevity of HIV-infected persons. In this review, the effects and benefits of ART on people living with HIV and AIDS based on studies done in developed and developing countries is examined. © 2012 Oguntibeju publisher and licensee Dove Medical Press Ltd.

Okoro H.K.,Cape Peninsula University of Technology
Reviews of Environmental Contamination and Toxicology | Year: 2011

Organotin compounds (OTCs) are organic derivatives of tin (Sn 4+) and are characterized by the presence of covalent bonds between three carbon atoms and a tin atom. The organotins are designated as mono-, di-, tri-, or tetra-organotin compounds and have the general formula (n-C 4H 9), Sn-X, where X is an anion or a group linked covalently through a hetero-atom (Dubey and Roy 2003; Okoro et al. 2011). Organotin pollution in the aquatic environment is of global concern; two triorganotin compound groups, the tributyltins and triphenyltins, are toxic to aquatic life (Fent 1996) and are used worldwide not only as biocides in antifouling paints but also as preserving agents for wood and timber, and as agricultural fungicides. These uses result in direct release to water, with consequential uptake and accumulation in aquatic fauna (Harino et al. 2000). © 2011 Springer Science+Business Media, LLC.

The present paper is concerned with the analysis of inherent irreversibility in hydromagnetic boundary layer flow of variable viscosity fluid over a semi-infinite flat plate under the influence of thermal radiation and Newtonian heating. Using local similarity solution technique and shooting quadrature, the velocity and temperature profiles are obtained numerically and utilized to compute the entropy generation number. The effects of magnetic field parameter, Brinkmann number, the Prandtl number, variable viscosity parameter, radiation parameter and local Biot number on the fluid velocity profiles, temperature profiles, local skin friction and local Nusselt number are presented. The influences of the same parameters and the dimensionless group parameter on the entropy generation rate in the flow regime and Bejan number are calculated, depicted graphically and discussed quantitatively. It is observed that the peak of entropy generation rate is attained within the boundary layer region and plate surface act as a strong source of entropy generation and heat transfer irreversibility. © 2011 by the authors.

Makinde O.D.,Cape Peninsula University of Technology
International Journal of Numerical Methods for Heat and Fluid Flow | Year: 2013

Purpose - The purpose of this paper is to investigate the combined effects of viscous dissipation and Newtonian heating on boundary-layer flow over a flat plate for three types of water-based nanofluids containing metallic or nonmetallic nanoparticles such as copper (Cu), alumina (Al2O 3), and titania (TiO2) for a range of nanoparticle volume fractions. Design/methodology/approach - The governing partial differential equations are transformed into ordinary differential equations using a similarity transformation, before being solved numerically by a Runge-Kutta-Fehlberg method with shooting technique. Findings - It is found that the heat transfer rate at the plate surface increases with increasing nanoparticle volume fraction and Biot number, while it decreases with the Brinkmann number. Moreover, the heat transfer rate at the plate surface with Cu-water nanofluid is higher than that of Al2O3-water and TiO2-water nanofluids. Practical implications - The heat transfer enhancement performances presented by nanofluids have led to innovative way of improving the thermal conductivities of working media in engineering and industries. This work provides a very useful source of information for researchers on this subject. Originality/value - This paper illustrates the combined effects of viscous dissipation and Newtonian heating on boundary-layer flow of nanofluids past a flat plate. © 2013 Emerald Group Publishing Limited. All rights reserved.

Makinde O.D.,Cape Peninsula University of Technology
Brazilian Journal of Chemical Engineering | Year: 2012

The combined effects of Navier slip and Newtonian heating on an unsteady hydromagnetic boundary layer stagnation point flow towards a flat plate in the presence of a magnetic field are studied. The self-similar equations are obtained using similarity transformations and solved numerically by a shooting algorithm with a Runge-Kutta Fehlberg integration scheme. The velocity profiles, temperature profiles, the local skin friction coefficient, and the local Nusselt number are computed and discussed in details for various values of the different parameters. Numerical results are presented both in tabular and graphical forms, illustrating the effects of these parameters on the thermal and concentration boundary layers. It is revealed that the thermal boundary layer thickens with a rise in the flow unsteadiness and as Newtonian heating intensifies, while the local skin friction and the rate of heat transfer at the plate surface change significantly due to the slip parameter.

Cronje J.C.,Cape Peninsula University of Technology
Computers and Education | Year: 2011

This article reflects on the cross-cultural communicative experiences of professors from South Africa and students from Sudan, during a two-year Internet-supported Masters' course in Computers in Education. Four of Hofstede's cultural dimensions were considered as categories of interpretation. The purpose of the research was to determine the extent to which Hofstede's static quantitative, research could be used as a basis for an essentially qualitative dynamic interpretation. While Hofstede's work focuses on cultural differences, this article tries to uncover what commonalities were constructed in the process. It was found that in this case, dimensions such as power distance and uncertainty avoidance tended to amplify each other, while together they resulted in a movement away from individualism towards collectivism. Accommodating across cultures did not mean that one should move into the other culture. Three elements seem to play a role when cultures meet: Reduction of communicative uncertainty, construction of shared meaning, and appropriate use of technology. More research should be conducted to uncover the elements that are common to cultures because emphasising commonality seems more useful than trying to overcome differences. © 2010 Elsevier Ltd. All rights reserved.

Makinde O.D.,Cape Peninsula University of Technology
Chemical Engineering Communications | Year: 2011

This article investigates the hydromagnetic mixed convection heat and mass transfer flow of an incompressible Boussinesq fluid past a vertical porous plate with constant heat flux in the presence of radiative heat transfer in an optically thin environment, viscous dissipation, and an nth order homogeneous chemical reaction between the fluid and the diffusing species. The dimensionless governing equations for this investigation are solved numerically by the fourth-order Runge-Kutta integration scheme along with shooting technique. Numerical data for the local skin-friction coefficient, the plate surface temperature, and the local Sherwood number have been tabulated for various values of parametric conditions. Graphical results for velocity, temperature, and concentration profiles based on the numerical solutions are presented and discussed. © Taylor & Francis Group, LLC.

Cape Peninsula University of Technology, Swedish Institute for Food and Biotechnology | Date: 2013-06-27

A fluid visualization and characterisation system includes a measuring section with a housing defining a fluid flow path for fluid flow. The measuring section includes one or more transducers to emit ultrasonic signals into the fluid flow, and at least one receiver to receive reflections of the ultrasonic signal from reflectors in the fluid flow. The system includes a memory for storing data and a processor operatively connected to the memory. The processor comprises several modules. A velocity estimating module is configured to apply one or more velocity estimation algorithms to received reflections of the ultrasonic signal, or data indicative thereof, to determine a velocity profile of the fluid flow. A deconvolution module is configured to apply a deconvolution algorithm at least to the determined velocity profile to determine a true velocity profile of the fluid flow. A fluid visualization and characterisation module is configured to determine characteristics of the fluid and/or fluid flow in by using the determined velocity profile and/or the true velocity profile.

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